@thuhavn
Go and click on the profile tab (icon next to log out) > click on the + and add another/new email address first > verify it > go back and click on update and tick the box underneath that says make primary > then you should get the remove option by the old now no longer primary email. You can remove that one or leave it on as you can have up to 8 email addresses on the one paypal account.
To change bank click on your paypal wallet and then add your new bank account and confirm it and then remove any old ones.
Advice is voluntary.
Kudos / Solution appreciated.
